Operating knob for endoscope



FIG. 1 is a perspective view of the front, top and left side of an operating knob for endoscope showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a partial rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The elements shown in broken lines do not constitute any part of the claimed design. 

The ornamental design for an operating knob for endoscope, as shown and described. 